Application Example of php curl Library

Using the PHP cURL library, you can easily and effectively capture webpages. You only need to run a script, analyze the web page you crawled, and then you can get the data you want as a program. Whether you want to retrieve part of the data from a link or an XML file and import it to the database, you may simply get the webpage content, cURL is a powerful PHP library.

Common functions of the CURL Library Function in PHP are as follows:

• Curl_close-close a curl session
• Curl_copy_handle-copy all content and parameters of a curl connection Resource
• Curl_errno-A number containing the current session error message is returned.
• Curl_error-returns a string containing the current session error message.
• Curl_exec-execute a curl session
• Curl_getinfo-obtains the information of a curl connection resource handle.
• Curl_init-initialize a curl session
• Curl_multi_add_handle-Add a separate curl handle resource to the curl batch processing session
• Curl_multi_close-close a batch processing handle Resource
• Curl_multi_exec-parse a curl batch handle
• Curl_multi_getcontent-return the obtained output text stream
• Curl_multi_info_read-obtains the transmission information of the currently resolved curl.
• Curl_multi_init-initialize a curl batch processing handle Resource
• Curl_multi_remove_handle-remove a handle resource from the curl batch processing handle.
• Curl_multi_select-Get all the sockets associated with the cURL extension, which can then be "selected"
• Curl_setopt_array-set session parameters for a curl in the form of an array
• Curl_setopt-set session parameters for a curl
• Curl_version-obtain curl-related version information
• The function curl_init () initializes a curl session. The unique parameter of the curl_init () function is optional, indicating a url address.
• The role of the curl_exec () function is to execute a curl session. The unique parameter is the handle returned by the curl_init () function.
• The function curl_close () is used to close a curl session. The only parameter is the handle returned by the curl_init () function.

Basic example

<? Php // initialize a cURL object $ curl = curl_init (); // set the URLcurl_setopt ($ curl, CURLOPT_URL, 'HTTP: // www.cmx8.cn ') to be crawled '); // set headercurl_setopt ($ curl, CURLOPT_HEADER, 1); // set the cURL parameter to ensure that the result is saved to the string or output to the screen. Curl_setopt ($ curl, CURLOPT_RETURNTRANSFER, 1); // run cURL, request webpage $ data = curl_exec ($ curl); // close URL request curl_close ($ curl ); // display the obtained data var_dump ($ data);?>

POST Data

Two form fields are accepted. One is the phone number and the other is the text message content.

<?php$phoneNumber　=　'13812345678';$message　=　'This　message　was　generated　by　curl　and　php';$curlPost　=　'pNUMBER='　.　urlencode($phoneNumber)　.　'&MESSAGE='　.　urlencode($message)　.　'&SUBMIT=Send';$ch　=　curl_init();curl_setopt($ch,　CURLOPT_URL,　'http://www.lxvoip.com/sendSMS.php');curl_setopt($ch,　CURLOPT_HEADER,　1);curl_setopt($ch,　CURLOPT_RETURNTRANSFER,　1);curl_setopt($ch,　CURLOPT_POST,　1);curl_setopt($ch,　CURLOPT_POSTFIELDS,　$curlPost);$data　=　curl_exec();curl_close($ch);?>

Use Proxy Server

<?php$ch　=　curl_init();curl_setopt($ch,　CURLOPT_URL,　'http://www.cmx8.cn');curl_setopt($ch,　CURLOPT_HEADER,　1);curl_setopt($ch,　CURLOPT_RETURNTRANSFER,　1);curl_setopt($ch,　CURLOPT_HTTPPROXYTUNNEL,　1);curl_setopt($ch,　CURLOPT_PROXY,　'proxy.lxvoip.com:1080');curl_setopt($ch,　CURLOPT_PROXYUSERPWD,　'user:password');$data　=　curl_exec();curl_close($ch);?>

Simulated Logon

Simulate login to the discuz program.

<? Php/*** Curl simulated login to the discuz Program * has not yet implemented the Forum login function for enabling verification codes */! Extension_loaded ('curl') & die ('the curl extension is not loaded. '); $ discuz_url = 'HTTP: // www.lxvoip.com'; // Forum address $ login_url = $ discuz_url. '/logging. php? Action = login '; // logon page address $ get_url = $ discuz_url.'/my. php? Item = threads '; // my post $ post_fields = array (); // you do not need to modify the following two items: $ post_fields ['loginfield'] = 'username '; $ post_fields ['loginsubmit '] = 'true'; // username and password, which must be set to $ post_fields ['username'] = 'lxvoip '; $ post_fields ['Password'] = '000000'; // security question $ post_fields ['questionid'] = 0; $ post_fields ['ancer'] = ''; // @ todo Verification Code $ post_fields ['seccodeverify '] = ''; // obtain the form FORMHASH $ ch = curl_init ($ login_url); curl_setopt ($ ch, CURLOPT_HEADER, 0); curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, 1); $ contents = curl_exec ($ ch); curl_close ($ ch ); preg_match ('/<input \ s * type = "hidden" \ s * name = "formhash" \ s * value = "(. *?) "\ S * \/>/I ', $ contents, $ matches); if (! Empty ($ matches) {$ formhash = $ matches [1];} else {die ('Not found the forumhash. ');} // POST the data to obtain the COOKIE $ cookie_file = dirname (_ FILE __). '/cookie.txt'; // $ cookie_file = tempnam ('/tmp'); $ ch = curl_init ($ login_url); curl_setopt ($ ch, CURLOPT_HEADER, 0 ); curl_setopt ($ ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt ($ ch, CURLOPT_POST, 1); curl_setopt ($ ch, CURLOPT_POSTFIELDS, $ post_fields); curl_setopt ($ Ch, CURLOPT_COOKIEJAR, $ cookie_file); curl_exec ($ ch); curl_close ($ ch ); // obtain the page content that requires logon with the COOKIE obtained above $ ch = curl_init ($ get_url); curl_setopt ($ ch, CURLOPT_HEADER, 0); curl_setopt ($ ch, cursor, 0); curl_setopt ($ ch, CURLOPT_COOKIEFILE, $ cookie_file); $ contents = curl_exec ($ ch); curl_close ($ ch); var_dump ($ contents);?>